Washing machine

ABSTRACT

A washing machine can have at least one heating element and be configured to perform a cycle of operation. A method of operation of the washing machine can include signaling a relay circuit to switch operation of the at least one heating element. A washing machine and a dryer can each have at least one heating element and be configured to perform a cycle of operation. The washing machine and dryer can be connected to a shared power source. A method of sharing power between the washing machine and the dryer can include allocating power between the washing machine and the dryer.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. patent applicationSer. No. 15/434,527, entitled “Washing Machine,” filed Feb. 16, 2017,now allowed, which is incorporated herein by reference in its entirety.

BACKGROUND

Laundry treating appliances, such as washing machines or dryers,typically include a rotatable drum or tub driven by an electricallyenergized motor, and a heating system to heat air and/or water suppliedto the appliances. These appliances are usually provided withindependent terminal blocks to be connected to either a 120V or a 240Vpower source. Some dryers may also be wired for 120V to poweraccessories.

BRIEF SUMMARY

In one aspect, illustrative embodiments in accordance with the presentdisclosure relate to a method of sharing power between a washing machineand a dryer, each having at least one heating element and configured toperform a cycle of operation, and both connected to a shared powersource, the method comprising allocating power between the washingmachine and the dryer by adjusting operation of respective heatingelements in the washing machine and the dryer.

In another aspect, illustrative embodiments in accordance with thepresent disclosure relate to a method of interoperation of a washingmachine with a dryer, each having at least one heating element andconfigured to perform a cycle of operation, and both connected to ashared power source, the method comprising switching operation of thewashing machine between two power levels in response to operationalcharacteristics of the dryer.

In yet another aspect, illustrative embodiments in accordance with thepresent disclosure relate to a method of operation of a washing machinehaving at least one heating element and configured to perform a cycle ofoperation, the method comprising signaling a relay circuit to switchoperation of the at least one heating element between first and secondpower levels.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a schematic three-dimensional view of a washing machine anddryer with power sharing capability through a terminal block with acommunication module.

FIG. 2A is a side view of a washing machine terminal block in the formof a piggyback power plug with a dryer power plug connected to a rearfacing electric socket of the piggyback power plug.

FIG. 2B is a rear perspective view of the piggyback plug of FIG. 2A witha cover member fastened on the rear facing electric socket.

FIG. 2C is a schematic view showing receptacle and plug terminal bladeconfigurations in a first embodiment for the piggyback plug of FIG. 2A.

FIG. 2D is a schematic view showing receptacle and plug terminal bladeconfigurations in a second embodiment for the piggyback plug of FIG. 2A.

FIG. 3 is a circuit diagram showing the connections of the relayswitches when the washing machine is connected to a 120V electricalpower source.

FIG. 4 is a circuit diagram showing the connections of the relayswitches when the washing machine is connected to a 240V electricalpower source.

FIG. 5 is a block diagram of a controller for the washing machine ofFIG. 1.

FIG. 6 is a block diagram of a method of power sharing to preventelectrical overloading when the dryer is energized while the washingmachine is in operation.

FIG. 7 is a block diagram of a method of power sharing to preventelectrical overloading when the washing machine is energized while thedryer is in operation.

FIGS. 8A-8D are schematic views of different cord configurationsavailable for different washing machine terminal blocks.

DETAILED DESCRIPTION

A laundry system according to aspects of the invention comprises awashing machine 10, a dryer 12, and at least one electrical power source25, which can be shared to provide power for both appliances 10, 12. Thelaundry system can include other conventional appliances for washing anddrying fabric items, such as clothes and linens Examples of otherlaundry appliances can include, but are not limited to, a washingmachine, including top-loading, front-loading, vertical axis, andhorizontal axis washing machines, a dryer, such as a tumble dryer,including top-loading dryers and front-loading dryers, a combinationwashing machine and dryer, a tumbling refreshing machine, an extractor,and a non-aqueous washing apparatus. The laundry appliances can be thesame type of laundry appliance, such as two washing machines, ordifferent types of laundry appliances, such as a washing machine and adryer.

Typically, in the U.S. a washing machine operates with a lower powersource than a dryer. For example, the washing machine may operate with a120V, 15 A power source while the dryer may operate with a 240V, 30 Apower source. Systems in accordance with the present disclosure providea washer configured with the capability to utilize a higher poweredsource (e.g., a 240V, 30 A power circuit) that is commonly used for thedryer to allow the use of a more powerful heating element withoutoverloading the typical washing machine power circuit. Exemplaryembodiments set forth below will be described with reference to a higherpowered 240V, 30 A power source and a lower powered 120V, 15 A powersource, though other types of power sources are within the scope of thepresent disclosure.

Washing machines in accordance with the present disclosure can beconfigured to run at either 240V, 30 A or 120V, 15 A, even when pluggedinto a 240V, 30 A power source, which can be a dedicated 240V, 30 Apower source or piggybacked onto the 240V, 30 A power source for thedryer. In certain embodiments, the washing machine 10 can be configuredto share a 240V, 30 A power supply with the dryer 12, in which case thedryer 12 is also configured to selectively run at either 240V, 30 A or120V, 15 A, even when plugged into the 240V, 30 A power source. Thisenables the washing machine and the dryer to efficiently “share”available power. For example, when either the washing machine 10 anddryer 12 are running alone, each may use the 240V, 30 A power source;whereas if they are simultaneously running, the washing machine 10 andthe dryer 12 may be configured to always runs on 120V, 15 A. Otherembodiments use more sophisticated forms of “sharing,” such as “smart”technologies in which the voltage demands of one or both of the washingmachine 10 and dryer 12 are monitored or sensed and the power isallocated accordingly.

For example, in one embodiment it is contemplated that both the washingmachine 10 and dryer 12 each have two 120V heating elements. If both thewashing machine 10 and dryer 12 are simultaneously demanding theactuation of a heating element, then both would operate just one oftheir respective heating elements, resulting in each of the washingmachine 10 and dryer 12 drawing 120V, 15 A. If both the washing machine10 and dryer 12 are running but only one of them is demanding theactuation of a heating element, then that appliance can draw the full240V, 30 A to energize both heating elements. In another embodiment,instead of two discrete 120V heating elements, either or both thewashing machine 10 and dryer 12 can have a variable output heatingelement, which would provide for essentially any division of the 240V,30 A supply between the washing machine 10 and the dryer 12. In yet afurther embodiment, either or both the washing machine 10 and the dryer12 can have one 120V heating element and one 240V heating element. Ifboth the washing machine 10 and dryer 12 are simultaneously demandingthe actuation of a heating element, then both would operate the 120Vheating elements. If both the washing machine 10 and dryer 12 arerunning but only one of them is demanding the actuation of a heatingelement, then that one can draw the full 240V, 30 A to energize the 240Vheating element. The “smart” control can also take into account powerdemands from other electrical components, especially those that consumea greater portion of the power, such as the motors, for example.

While the specific examples of power supply in this disclosure are for240V and 120V power supplies, the disclosure has applicability to othercombinations of power supplies, and is not limited to a 240V/120Vconfiguration. For example, while in the United States, 240V and 120Vpower supplies are standard, in other countries, other voltages arestandard.

FIG. 1 illustrates an exemplary washing machine 10 and dryer 12, whichare configured to implement one or more of these aspects of theinvention. For simplicity sake, the washing machine 10 and dryer 12 aredefined by schematic three-dimensional cubes. As a non-limiting example,the washing machine 10 can include a fixed outer tub 11 and a rotatableinner basket or drum 13 being driven by an electrically energized motor14. A water pump 15 is provided for supplying water to or extractingwater from the tub 11 or drum 13. The washing machine 10 can be providedwith a heating system which can include at least one heating element 16for heating washing liquid supplied to the washing machine 10. In thisembodiment there a two heating elements 43 a, 43 b. One heating element43 a is operable at 120V and the other heating element 43 b is operableat 240V. As mentioned above, it is contemplated that other embodimentsmay have two 120V elements or a single variable output heating elementin the washing machine 10.

As a non-limiting example, the clothes dryer 12 can include a rotatablysupported clothes drying drum 17 which is driven by an electricallyenergized motor 18. The motor 18, in addition to rotating the drum 17,can drive a centrifugal type blower 19 which causes air to flow throughthe clothes drying drum 17. In some configurations, a separate motor isprovided for the blower 19. The dryer 12 can be provided with a heatingsystem comprising at least one heating element 20 to heat the dry airflowing into the clothes drying drum 17. Like the washing machine 10,there can be two heating elements, one operable at 120V and anotheroperable at 240V. As mentioned above, it is contemplated that otherembodiments may have two 120V elements or a single variable outputheating element in the clothes dryer 12.

Referring further to FIG. 1, the washing machine 10 includes in thisembodiment a terminal block 21 in the form of a piggyback plug 22,configured to connect to a conventional electrical power source 25 of240V. Referring to FIG. 2A, the piggyback plug 22 includes a rear facingelectrical socket 24 with a unique terminal layout 26 a, b (FIGS. 2C and2D) designed only to receive a compatible dryer power plug 26. Referringto FIG. 2B, when not in use, the rear facing electrical socket 24 can beprovided with a cover member 30 that can be fastened to the surface ofthe rear facing electrical socket 24 via a fastener 32.

The piggyback plug 22 in one embodiment allows for power sharing betweenthe washing machine 10 and the dryer 12 from a single 240V power source25 by way of a communication module 28, here illustrated as a genericcommunication between the washing machine 10 and the dryer 12. In thiscontext, it will be understood that the communication module 28 includesall the circuitry needed to effectively enable data communicationbetween the washing machine 10 and the dryer 12, including but notlimited to wired or wireless communication, peer-to-peer or networkcommunication, and with or without an intermediate server. Examples ofsuch communication are found in U.S. Pat. No. 8,345,686 and U.S. Pat.No. 8,155,120, both of which are incorporated herein by reference.

As shown in FIGS. 2C and 2D, the power terminal blade layout 24 a of therear facing electrical socket 24 and the corresponding blade layout 26 aof the dryer power plug 26 may be different from what is commonly usedin the washing machine industry for a 3-prong connections. For anotherexemplary configuration, the terminal blade layout 24 b of the rearfacing electrical socket 24 and the corresponding blade layout 26 b ofthe dryer power plug 26 would be different from what is commonly used inthe washing machine industry for a 4-prong connection. The bladeconfigurations can be oriented differently in order to prevent the useof other existing power plugs with the rear facing electrical socket 24.Thus, the rear facing electrical socket 24 limits the power sharingfeature to specific compatible dryers with compatible power plugsdesigned to work in conjunction with the washer 12 of the presentembodiment.

Referring now to FIG. 3, the washing machine 10 further comprises afirst electrical circuit 40 configured to operate motors 14 and pumps 15associated with a clothes washing cycle. A second electrical circuit 42is configured to operate the first heating element 43 a or the secondheating element 43 b depending on an available or selected 120V or 240Vpower source, wherein the first heating element 43 a is operable at 120Vand the second heating element 43 b is operable at 240V. The first andsecond electrical circuits 40, 42 are connected to one or more terminalblocks 44 that can adapted to be selectively connected to one of a 120Vor 240V electric power source 25 (see discussion below). The terminalblock 44 may be the piggy back terminal block 21 discussed above. Acontroller 45 coupled with a sensor 46 and adapted to sense the voltagefrom the terminal block 44 is coupled to a plurality of relay switches50, 52, 54. The controller 45 is configured to energize or de-energizethe relay switches 50, 52, 54 based on a signal from the sensor 46 toautomatically adjust the first and second electrical circuits 40, 42 tothe voltage from the terminal block 44. The controller 45 is furtherconfigured to reduce power consumed by the dryer 12 (FIG. 1) dependingon the power usage of the washing machine 10 (FIG. 1) by way of thecommunication module 28 (FIG. 1) connecting the controller 45 to theclothes dryer 12.

The plurality of relay switches includes a single pole double throw(SPDT) relay switch 50 and two double pole double throw (DPDT) relayswitches 52, 54 which are connected to the power source via leadsL1-N-L2 in the terminal block 44, representing in this embodimentconnections to a conventional 240V circuit in the U.S. The pair ofterminals L1, L2 for connection to 120V/240V hot leads, and the terminalN being a machine ground terminal.

The SPDT relay switch 50 includes five terminal points: a normally openswitch (NO), a normally closed switch (NC), a common of the relay (C),and two coil terminals (CL) that can be powered to open the switch. EachDPDT relay switch 52, 54 includes eight terminal points: first normallyopen switch (NO1), second normally open switch (NO2), first normallyclosed switch (NC1), second normally closed switch (NC2), first commonof the relay (C1), second common of the relay (C2) and two coilterminals (CL) that can be powered to close the switches.

In FIG. 3, where 120V is drawn from the terminal block 44, the NC and NOterminals of the SPDT relay switch 50 are connected to L1 and L2 leadsin the terminal block 44 respectively. The CL terminals are connected toL2 and N leads of the terminal block 44. The C terminal of the SPDTrelay switch 50 is connected to the NC1 terminal of the first DPDT relayswitch 52 through the controller 45. The corresponding C1 terminal ofthe first DPDT relay switch 52 is connected to the second circuit 42where it forms a continuity with the C1 terminal of the second DPDTrelay switch 54. The corresponding NC1 terminal of the second DPDT relayswitch 54 is connected to the N lead of the terminal block 44. In thisconfiguration, regardless of whether the CL terminals of the SPDT relayswitch 50 are energized by the wiring of 120V via the L1 or L2 leads,the same power will be provided to the first circuit 40 and the 120Vfirst heating element 43 a of the second circuit 42. The SPDT relayswitch 50 is adapted as a failsafe to selectively connect to a 120Velectric power source regardless of the wiring using either L1 or L2leads.

Referring to FIG. 4, where 240V is drawn from the terminal block 44, thefirst circuit 40 will still receive 120V through the C terminal of theSPDT relay switch 50. On the other hand, the sensor 46 in the controller45 will detect the available 240V and energize the CL terminals in bothDPDT relay switches 52, 54 creating continuity between the C1, 2 andNO1, 2 terminals respectively. In this configuration, the 120V powersource channeled through the C terminal of the SPDT relay switch 50 tothe second circuit 42 will be cut off when the switches 48 in both DPDTrelay switches 52, 54 shift to the NO1 and NO2 terminals. Instead, thecontroller 45 will provide continuity between L1 and L2 lead of theterminal block 44 through the NO2 terminals of the DPDT relay switches52, 54 with their C2 terminals connected to the second heating element43 b of the second circuit 42. In this example, the washing machine hasthe capability to utilize 240V power source for the 240V-rated secondheating element 43 b. The 240V supply to the second heating element 43 bof the second circuit 42 effectively reduces the overall current draw tothe second circuit 42 under similar power conditions and has theopportunity to significantly increase the power output of the secondheating element 43 b while using the same or even less energy than the120V supplied heating element 43 a. The opportunity to utilize morepower through the second heating element 43 b translates to faster waterheating while concurrently tumbling to promote a faster time to anacceptable washing performance.

The circuitry in FIGS. 3 and 4 can be used with or without power sharingbetween the washing machine 10 and dryer 12. Looking now at FIG. 5, thewashing machine 10 will also typically include a controller 96 forcontrolling the operation of the washing machine 10 to implement one ormore cycles of operation. A user interface 98 is operably coupled withthe controller 96. The user interface 98 may include one or more knobs,dials, switches, displays, touch screens and the like for communicatingwith the user, such as to receive input and provide output. The user mayenter different types of information including, without limitation,cycle selection and cycle parameters, such as cycle options.

The controller 96 may include the machine controller and any additionalcontrollers provided for controlling any of the components of thewashing machine 10, including for example, the controller 45 in thefirst and second electrical circuits 40, 42. Many known types ofcontrollers may be used for the controller 96. It is contemplated thatthe controller is a microprocessor-based controller that implementscontrol software and sends/receives one or more electrical signalsto/from each of the various working components to effect the controlsoftware. As an example, proportional control (P), proportional integralcontrol (PI), and proportional derivative control (PD), or a combinationthereof, a proportional integral derivative control (PID control), maybe used to control the various components.

The controller 96 may be provided with a memory 100 and a centralprocessing unit (CPU) 102. The memory 100 may be used for storing thecontrol software that is executed by the CPU 102 in completing a cycleof operation using the washing machine 10 and any additional software.Examples, without limitation, of cycles of operation include: wash,heavy duty wash, delicate wash, quick wash, pre-wash, refresh, rinseonly, and timed wash. The memory 100 may also be used to storeinformation, such as a database or table, and to store data receivedfrom one or more components of the washing machine 10 that may becommunicably coupled with the controller 96. The database or table maybe used to store the various operating parameters for the one or morecycles of operation, including factory default values for the operatingparameters and any adjustments to them by the control system or by userinput. The controller 96 may be provided with the communication module28 to enable communication between the washing machine 10 and a dryer12.

The controller 96 may be operably coupled with one or more components ofthe washing machine 10 for communicating with and controlling theoperation of the component to complete a cycle of operation. Forexample, the controller 96 may be operably coupled with a motor 88, apump 74, a dispenser 62, a steam generator 82 and a sump heater 84 tocontrol the operation of these and other components to implement one ormore of the cycles of operation. And the controller 96 can be operablycoupled with the controller 45 to control operation of the heatingelements 43 a, 43 b. It will be understood that the functions of thecontroller 45 can be incorporated into the controller 96, in which casethe controller 45 may be superfluous and can be omitted.

The controller 96 may also be coupled with one or more sensors 104provided in one or more of the systems of the washing machine 10 toreceive input from the sensors, which are known in the art and not shownfor simplicity. Non-limiting examples of sensors 104 that may becommunicably coupled with the controller 96 include: a treating chambertemperature sensor, a moisture sensor, a weight sensor, a chemicalsensor, a position sensor and a motor torque sensor, which may be usedto determine a variety of system and laundry characteristics, such aslaundry load inertia or mass. And the controller 96 can be operablycoupled with the sensor 46 adapted to sense the voltage from theterminal block 44.

For power sharing between the washing machine 10 and the dryer 12 viathe terminal block 44, it will be understood that the dryer 12 will havea similar controller configured to at least determine cycle parametersin the dryer and communicate with the controller 96 and/or with thecontroller 45 in the washing machine 10. Either the controller 96 or thecontroller 45 (or both) is configured to receive signals representativeof available power from the sensor 46, determine the status ofcomponents associated with a cycle of operation in the washing machine10, communicate with the dryer 12 by way of the communication module 28,transmit data about the washing machine 10 to the dryer 12, receive dataabout the dryer 12 from the dryer 12, and negotiate with the dryer aboutscheduling or determining power needs for the heating elements 43 a, 43b. For example, the controller 96 may have an algorithm to preventelectrical overloading by signaling the dryer 12 to reduce theelectrical power consumed by the dryer 12 when simultaneous energizationof the washing machine 10 and dryer 12 occurs. As the dryer 12 heatingsystem includes two heating elements operable at 120V and 240Vrespectively, power consumption of the dryer can be reduced by the dryercontroller activating the 120V heating element in the dryer 12 insteadof the 240V heating element and the washing machine controller 96activating the 120V heating element in the washing machine 10 instead ofthe 240V heating element.

Referring to FIG. 6 in an exemplary communication between the washingmachine 10 and the dryer 12, provided that a 240V power source isavailable and power is to be shared between the washing machine 10 andthe dryer 12, the controller 96 first determines at step 200 whether thewashing machine 10 is running and, if so, at step 202 whether the atleast one heater 16 in the washing machine 10 is energized. Meanwhilethe controller 96 will have received data from the dyer 12 indicatingthe status of the at least one heater in the dryer 12. If the washingmachine 10 is not running, or if the at least one heater 16 in thewashing machine 10 is not energized, the controller 96 determines atstep 204 the status of the at least one heater in the dryer 12 andsignals the dryer at step 206 that it can operate at full power. If theat least one heater 16 in the washing machine 10 is energized, thecontroller 96 determines at step 208 the status of the at least oneheater in the dryer 12 and signals the dryer at step 210 that it canoperate at full power, e.g.,240V, or a reduced power, e.g.,120V.

Referring to FIG. 7 in another exemplary communication between thewashing machine 10 and the dryer 12, when the washing machine 10 isenergized the controller 96 determines at step 300 whether the dryer 12is running. If not, then the controller 96 determines at step 302 if acycle of operation needs the at least one heater 16 in the washingmachine to be energized. If so, at step 304 the controller 96 signalsdirectly (or indirectly through controller 45) to energize one or bothof the heating elements 43 a, 43 b. If the controller 96 determines atstep 300 that the dryer 12 is running, it then determines (viacommunication with the dyer 12) whether the heating element in the dryeris energized at step 306. If the heating element in the dryer is notenergized, then the controller 96 determines at step 302 if a cycle ofoperation needs the at least one heater 16 in the washing machine to beenergized. If the heating element in the dryer is determined to beenergized at step 306, then then the controller 96 determines at step308 the state of the heating element 20 in the dryer 12, e.g., if thedryer heating element is operating at 120V (half power) or 240V (fullpower). If the washing machine needs heating when the dryer is operating240V at full power, the controller 96 can signal the dryer 12 at step310 to operate at half power (e.g., with the 120V heating element). Thecontroller 96 further validates at step 312 whether the dryer operatesat the reduced power. If reduced power in the dryer 10 is validated, thecontroller 96 can signal the heating element 16 in the washing machine10 at step 318 to go to full power (e.g., 240V). The instruction step at310 and the validation step at 312 can cycle up to three times at 314before the controller 96 enters a waiting state at step 316 if the dryerfails to operate at reduced power. This safety measure in the methodprevents activation of the washing machine 240V heating element when thedryer is also operating with a 240V heating element to preventelectrical overload. If the washing machine needs heating when the dryeris operating at half power, the controller 96 can signal the dryer 12 atstep 318 to energize the heater in the washing machine 10 at reducedpower (e.g., 120V), and if not, the controller 96 can signal the dryer12 at step 320 to energize the heater in the dryer 12 at full power(e.g., 240V).

The washing machine of the present embodiment can be connected safely toeither 120V or 240V electrical power source with the capability to sharethe same power source with the dryer through the piggyback plug. Thepower sharing capability allows for the heating system in the washer tobe supplied with 240V to expedite heating when there is no demand fromthe dryer, improving overall efficiency between the washing and dryingperformance. The power sharing algorithm protects the washing machineand dryer from overloading the power source to maintain a stablesimultaneous operation of both appliances using the same power source.

In another aspect related to the washing machine, FIGS. 8a-8d illustratedifferent possible cord configurations available to a user for selectionwith the terminal block 44. In FIGS. 8A and 8C, a user can select a 120VAC cord 340 with a 3-prong plug for connection between the terminalblock and the power source 25 at a conventional 120V receptacle, withone end plugged into the L1 lead of the terminal block 44 (FIG. 8A) orthe one end plugged into the L2 lead of the terminal block 44 (FIG. 8C).In FIG. 8B, a user can select a 240V 20 amp AC three-wire cord 350 witha 3-prong plug for connection between the terminal block 44 and thepower source 25 at a conventional 240V receptacle. In FIG. 8D, a usercan select a 240V 20 amp AC four-wire cord 360 with a 4-prong plug forconnection between the terminal block 44 and the power source 25 at aconventional 240V receptacle. In another embodiment (not shown), theterminal block 44 can include two terminal blocks on the washer toprovide connection to either a 120V power source or a 240V power sourceat a user's choice, where one is a conventional 120V block and the otheris a conventional 240V block. While the invention has been specificallydescribed in connection with certain specific embodiments thereof, it isto be understood that this is by way of illustration and not oflimitation. Reasonable variation and modification are possible withinthe scope of the forgoing disclosure and drawings without departing fromthe spirit of the invention, which is defined in the appended claims.For example, with respect to heater elements in the laundry treatingappliance, it is within the scope of the disclosure for there to be twoheater elements, each operating at 120V with either heater elementswitched on or off depending on available power, or for there to be asingle heater element configured to operate at either 120V or 240Vdepending on available power. It is also within the scope of thedisclosure for power sharing between the washing machine and the dryerto include the heater elements in each appliance to draw full power at240V, but where the power is pulsed or switched between them so only oneis drawing full power at a time.

What is claimed is:
 1. A method of sharing power between a washingmachine and a dryer, each having at least one heating element andconfigured to perform a cycle of operation, and both connected to ashared power source, the method comprising allocating power between thewashing machine and the dryer by adjusting operation of respectiveheating elements in the washing machine and the dryer.
 2. The method ofclaim 1 further comprising determining whether one of the washingmachine or the dryer has the at least one heating element in the one ofthe washing machine or the dryer energized at a first power level. 3.The method of claim 2 further comprising determining whether the otherof the washing machine or the dryer needs to energize the at least oneheating element in the other of the washing machine or the dryer in acycle operation in the other of the washing machine or the dryer.
 4. Themethod of claim 3 further comprising allocating power between thewashing machine and the dryer by energizing the at least one heatingelement in the other of the washing machine or the dryer or adjustingthe first power level of the at least one heating element in the one ofthe washing machine or the dryer to a second power level lower than thefirst power level and then energizing the at least one heating elementin the other of the washing machine or the dryer.
 5. The method of claim4 wherein the first power level is 240V AC and the second power level is120V AC.
 6. The method of claim 4 further comprising validating thesecond power level of the one of the washing machine or the dryer.
 7. Amethod of interoperation of a washing machine with a dryer, each havingat least one heating element and configured to perform a cycle ofoperation, and both connected to a shared power source, the methodcomprising switching operation of the washing machine between at leasttwo power levels in response to operational characteristics of thedryer.
 8. The method of claim 7 wherein the switching operation of thewashing machine between two power levels comprises energizing orde-energizing heating elements.
 9. The method of claim 7 furthercomprising reducing power consumed by the dryer depending on a powerusage of the washing machine.
 10. The method of claim 7 furthercomprising automatically reducing electrical power consumed by thewashing machine when simultaneous energization of the washing machineand dryer occurs.
 11. The method of claim 7 further comprisingdetermining whether one of the washing machine or the dryer has the atleast one heating element in the one of the washing machine or the dryerenergized at a first power level.
 12. The method of claim 11 furthercomprising determining whether the other of the washing machine or thedryer needs to energize the at least one heating element in the other ofthe washing machine or the dryer in the cycle of operation of the otherof the washing machine or the dryer.
 13. The method of claim 12 furthercomprising allocating power between the washing machine and the dryer byenergizing the at least one heating element in the other of the washingmachine or the dryer or adjusting the first power level of the at leastone heating element in the one of the washing machine or the dryer to asecond power level lower than the first power level and then energizingthe at least one heating element in the other of the washing machine orthe dryer.
 14. A method of operation of a washing machine having atleast one heating element and configured to perform a cycle ofoperation, the method comprising signaling a relay circuit to switchoperation of the at least one heating element between first and secondpower levels.
 15. The method of claim 14 wherein the switching operationof the at least one heating element between first and second powerlevels comprises energizing or de-energizing the at least one heatingelement.
 16. The method of claim 14 further comprising coupling acommunication module to a controller configured to communicate withanother laundry treating appliance connected to at least one powersource, wherein the controller can allocate power between the washingmachine and the other laundry treating appliance.
 17. The method ofclaim 16 further comprising connecting the washing machine and the otherlaundry treating appliance to the at least one power source by apiggyback power plug.
 18. The washing machine of claim 17 wherein thepiggyback power plug is connected to one of the washing machine or theother laundry treating appliance and has a rear facing electric socketconfigured to receive a plug from the other of the washing machine orthe other laundry treating appliance.
 19. The washing machine of claim18 wherein the rear facing electric socket includes a unique powerterminal layout configured to receive a compatible power plug.
 20. Thewashing machine of claim 19 wherein the power plug is adapted to receivea compatible other laundry treating appliance power plug to allow thepower sharing from a single power source.